MerCruiser 350 MAG MPI Owner's Manual

Section 5 - Maintenance
Page 58 90-864197070 JUNE 2007
Maintenance Schedule ‑ Inboard Models
Routine Maintenance
NOTE: Only perform maintenance which applies to your particular power package.
EACH DAY START
• Check the crankcase oil (interval can be extended based on experience).
• Check the transmission fluid level.
EACH DAY END
• If operating in salt, brackish or polluted waters, flush the cooling system after each use.
WEEKLY
• Check the water inlets for debris or marine growth. Check the seawater strainer and
clean.
• Check the coolant level.
• Check the transmission fluid.
EVERY TWO MONTHS OR 50 HOURS
• Operating in saltwater or brackish or polluted water only: treat the power package with
Corrosion Guard.
• Check the battery connections and the fluid level.
•
Ensure that the gauges and the wiring connections are secure. Clean the gauges.
1.
Scheduled Maintenance
NOTE: Only perform maintenance which applies to your particular power package.
AFTER THE INITIAL 20 HOUR BREAK-IN PERIOD
To help extend the life of your Mercury MerCruiser power package, we recommend the
following:
• Change the engine oil and filter
• Change the transmission oil and filter on inboard models.
NOTE: ZF Marine requires the transmission to be changed to preserve the warranty.
EVERY 100 HOURS OR ANNUALLY (WHICHEVER OCCURS FIRST)
• Touch‑up the paint on the power package.
• Change the crankcase oil and filter.
•
Change the transmission fluid (ZF Transmission Models)
2.
• Replace the water separating fuel filter element.
• Check the steering system and the remote control for loose, missing or damaged parts.
Lubricate the cables and the linkages.
• Inspect the condition of the belts.
•
Clean the flame arrestor, IAC muffler
3.
, and the crankcase ventilation hoses. Inspect
the PCV valve, if equipped.
EVERY 300 HOURS OR 3 YEARS
• Check the engine mount for tightness and retorque if necessary.
• Check the distributor cap, if equipped.
• Check the electrical system for loose, damaged, or corroded fasteners.
1. If operating in saltwater, interval is reduced to every 25 hours or 30 days whichever occurs first.
2. Require fluid and filter change after the first 25 hours and then every 100 hours.
3. Contact your authorized Mercury MerCruiser dealer to replace the IAC muffler.

MerCruiser 350 MAG MPI Specifications

General

Engine Type	V8
Horsepower	300 HP
Ignition System	Electronic ignition
Alternator	65 amp
Compression Ratio	9.4:1
Displacement	5.7L (350 cu in)
Fuel System	Multi-Point Injection (MPI)
Bore x Stroke	4.00" x 3.48" (101.6mm x 88.39mm)